Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!sun-barr!newstop!exodus!vladimir
From: vladimir@prosper.EBB.Eng.Sun.COM (Vladimir G. Ivanovic)
Newsgroups: comp.lang.scheme
Subject: Unknown symbol in Elk
Message-ID: <VLADIMIR.90Dec1213048@prosper.EBB.Eng.Sun.COM>
Date: 2 Dec 90 05:30:48 GMT
Sender: news@exodus.Eng.Sun.COM
Organization: Sun Microsystems, Inc.
Lines: 47

What does the symbol '#v' mean in the following program from a test in the Elk
1.2 distribution?  Both R3RS and the Elk Reference Manual are silent about
'#v'.  MacScheme 2.0 doesn't like it, but Elk happily consumes it.

-- Vladimir

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; -*-Scheme-*-

(define acc)
(define bcc)
(define n 5)

(define (a)
  (if (not (= 0 (call-with-current-continuation
		 (lambda (cc)
		   (set! acc cc) 0))))
      (if (> n 0)
	  (begin
	    (set! n (- n 1))
	    (display "resume b") (newline)
	    (bcc 1))
	  #v)					      ;;; What does this mean?
      acc))

(define (b)
  (if (not (= 0 (call-with-current-continuation
		 (lambda (cc)
		   (set! bcc cc) 0))))
      (begin
        (display "resume a") (newline)
        (acc 1)))
  bcc)

(a)
(b)
(acc 1)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
--
==============================================================================
   Vladimir G. Ivanovic				Sun Microsystems, Inc
     (415) 336-2315				2550 Garcia Ave., MTV12-33
    vladimir@Sun.COM				Mountain View, CA 94043-1100

      Disclaimer: I speak only for myself.  Your mileage will vary.
==============================================================================


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